Telephone-exchange system



May 8. 1928.

' 1,668,677 w. H. HARVEY f TELEPHONE EXCHANGE .SYSIBI Filed Oct. 30. 1926 by the two supervisory Patented May 8, 1928.

` UNITED STATES PATENT orifice."

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i application ma amber ao, im. semi n. 145,144.`

This invention relates to metering systems for telephone exchanges and more particularly to means for recording, the number of calls made and the duration of each call.

A system constructed in accordance with this invention consists of an electromagnet having two coacting armatures and control circuits therefor so arranged that when a call is made both armatures operate to cause the operation of two counting trains, one of said armatures thereafter re eatedly releasing and o erating to cause t e repeated actuation o one of said counting trains for measuring the duration of the call and one of said armatures operatin but once tocause the single operation of t e other of said counting trains to record the call.

The invention has been illustrated in the accompanying drawing by showing in diagrammatic form an electromagnetic structure and associated registering devices with suitable circuit arrangements or the control thereof.

Referring now to the drawing the electromagnet lis provided with se arate windin 2, 3 and 4. Winding 2 is o comparative y low resistance and winding 3 is of a high resistance. Winding 3 is normally shortfcircuited by a pair of contacts 5. Winding 4 is of low resistance and connected to a tlming interrupter 6 through a pair of normally open contacts 7. Electroma net 1 is provided with armatures 8 an 9, operating counting trains 10 and 11 through pawls 12 th and 13 respectively. The armature 8 which operates counting train 10 is also adapted to operate the two pairs of contacts 5 and 7.-

It is evident that any well-known type of counting trains may be employed and for that reason only a diagrammatic showing has been made in the drawing. It is understood', that for each operation of armature 8, counting train 10 will be actuated once to register a call, and that for each operation of armature 9, counting train 11 will be operated once to register a unit of time.

The o eration ofthis device when applied to the te ephone system diagrammatically illustratedin the drawing is as follows: For example, the windings 2 and 3niay be connected to the energizing circuit 14 controlled relays 15 and 16 oi a' cord circuit 17. This energizing circuit is closed when the cord circuit is used for connectin two subscribers lines such as 18 and 19 an when the subscribers of these lines have their receivers olf the hook. As noted, the winding 3 is normally short-circuited by contacts 5, hence this energizin circuit when closed will only be complete through the operating winding 2 and the current passing through this circuit under these circumstances will be sullcient to operate both armatures 8 and 9. Counting trains 10 and 11 will thereby each be actuated once.

As the armature 8 completes its stroke it o crates contacts 5 and 7. Contacts 5 open t .e short circuit for the hi h resistance winding 3 which will thereby inserted in series relation with the operating winding 2, while contacts 7 will close a circuit for winding 4 through the energizing circuit 20, controlled by the timing interrupter 6. The resistance added by winding 3 reduces the current in circuit 14 to a value which will provide sulicient ampere turns to hold the armature 8 in its operating position, but said value is not suiicient to hold armature 9 1n its operated position which will therefore restore to normal. Armature 8 in its olperated position maintains the circuit 20 c osed to the interrupter 6 and on each o eration of the interrupter 6 to complete t e circuit, the magnet will operate to attract armature 9. Consequentl ,meter 11 will be operated repeatedly at stated intervals as determined y the interrupter 6 as long as e supervisory relays are operated to maintain armature 8 actuated. In other` words, counting train -11A` will measure the time of a conversational connection between two subscribers, while the counting train 10.will op erate once to re 'ster this connection.

It is evident t at the invention is not limited to the particular structural arrangement and circuit shown in the drawing but may be applied in different form and to dilerent systems without departing from the spirit thereof. y

What is claimed is:

1. The combination with an electromagnet of two counting trains, means controlled by said electromagnet to actuate said counting trains once and means` for causing the re' eated release and actuation of one of sai counting trains while the other counting train 1s maintained actuated.

associated therewi means for controlling said electro to operate one counting 10 ing train once an to operate and release the other countingtrain at predetermined' intervals during t e actuation of the first counting train. I

4. An electromagnet, twopcounting trams l controlled by said electromagnet, means for energizing said electromagnet to operate both of said counting trains and release one counting train, and means for causin thereafter the re I the origin y released counting train.

5. An electromagnet, two counting trains controlled by said electromagnet, means for energizing said electromagnet to operate both of said counting trains, means for l thereafter rel f one of said counting trains and maintaining the other countin train o erated for a certain -period, an means or repeatedly actuating and releasing the origlnally released counting train at redetermined intervals during said per1o 6. An electromagnet, two counting trains controlled by said electromagnet, means for energizing said electromagnet to operate both of said counting trains simultaneous- 1y, means for thereafter releasin one of said counting trains, and means or thereafter re atedly actuating and releasin the original y releasedV counting train an permanently releasing both of said counting trains after a certain interval.

7. An electromagnet, two counting trains controlled by said electromagnet, means for energizing said electromagnet for actuating both of said counting trains, means for thereafter maintaining one of said countactuation and re ease of' for i a y Lease?? in trains operated and for rel the o er, and means controlled b said first means for 'independently contro the releasedcountingtrain. i y

8. An electromagnet, .two counting trains controlled by said electromagnet, means for ener vsaid electromagnet to actuate both of said counting trains and for thereafter maintaining one of said counting' trains-operated and for releasing the other, means controlled b said first means for independently actuating and releasing the released counting 4,train at redetermined intervals, and means for re easing the originally actuatedcounting train and preventing further operation and 'release of the ot e r counting train. -9. An electromagnet having two *armatures, a counting train controlled by one armature and another vcounting traincontrolled by the other armature, a circuit for said electromagnet for causing the operation of both armatures, means controlled by one armature for changin said circuit 'l0 to cause the release ofthe ot er. amature, and another circuit closed through said electroma et b operated or in ependent control of the re-` leased -armature 10. An electromagnet having two armatures, a counting train controlled by one armature and another counting train controlled by the other armature, a circuit for said electromagnet for the o ration of both armatures, means controlled)e by the o ration of one armature for changing sai circuit to cause the release of the other armature, another circuit. closed through said electromagnet by the armature remainin operated, and means for controlling said other circuit to re eatedly o erate and release the original y release armature.

In witness whereof, I hereunto subscribe my name this 29th day of October, A. D. 00

WILLIAM H. HARVEY.

the armature remainingl 7 

